Grinding machine



S. EINSTEIN ET AL GRINDING momma Nov. 27; 1934.

Filed ma 25 1931 3 Sheets-Sheet 1 gwuent 5 73- w, m W

Nov. 27, 1934. s. EINSTElN ET AL 1,982,287

GRINDING MACHINE I Filed May 25, 1931 3"Sheets-S heet 3 duo: wet;

Patented Now 27, 1934 GRINDING MACHINE Sol Einstein and Frederick S.Haas, Cincinnati,

hi0, assignors to Cincinnati Grinders Incorporated, Cincinnati, Ohio, acorporation of Ohio Application May 25, 1931, Serial No. 539,750

Claims.

' 19 tion between the sliding ways or faces of the bed or support of themachine and the wheel head proper is reduced to a minimum.

A further object of the invention is the provision of improved means foreliminating to a 1'5 maximum degree the possibility of vibration of thegrinding wheel head while its wheel is in operative engagement with thework, thereby reducing chatter on the work to a minimum and insuring asuperior grade and finish of work.

A still further'object of the invention is the provision of an improvedgrinding machine embodying the usual heavy wheel head together with animproved support therefor which will materially reduce both themechanical and hand power necessary to effect the actuation thereofrelative to its bed or support.

Other objects and advantages of the present invention should be readilyapparent by reference to the following specification considered inconjunction with the accompanying drawings forming a part thereof, andit is to be understood that any modifications may be made in the exactstructural details there shown and described without departing from orexceeding the spirit of the invention as defined by the appended claims.

In the drawings: Figure 1 is a front elevation of a grinding machineembodying the improvements of this invention.

Figure 2 is a fragmentary sectional view taken on line 2-2 of Figure 1.

Figure 3'is a sectional view taken on line 3--3 of Figure 2.

Figure 4 is a view partly in section and partly in elevation as seenfrom line 4-4 of Figure 3.

Figure 5 is a perspective view of a fragment of the anti-frictionbearing embodied in this invention. I I

Figure 6 is a sectional view taken on line 6-6 of Figure 5.

Figure 7 is a fragmentary view taken on line 7-7 of Figure 2.

Throughout the several views of the drawings similar referencecharacters are employed to indicate the same or similar parts.

A device of this invention may "comprise a bed or support 10 havingformed at the upper end thereof ways 11 and 12 for guiding the carriage13 longitudinally of the bed 10. The carriage 13 has adjustably securedthereto headstock 14 and tailstock 15 from which suitable centers as 16project for engagement with a rotating work piece 17. The carriage 13 isreciprocated by any known means for traversing the work 17 past theactive face of the grinding wheel 18.

The bed 10 is further provided with a lateral extension 19 forming ways20 and 21 on which is supported the grinding wheel carriage 22 formovement toward the work to effect the desired feed between the work andgrinding wheel. The grinding wheel 18 is secured to one end of a spindle23 journaled in suitable bearings 24 formed integral with or secured tothe carriage 22. In order to effect the feeding movement of thecarriage22 it is provided interiorly thereof with a web 25 in which issecured a nut 26 in threaded engagement with the threaded end 2'7 of anadjusting screw 28. Rotation is imparted to the screw 28 by a gear 29secured to its rear end 30 which is positioned internally of a suitableguard or housing 31 which in addition forms a journal as at 32 for. thescrew 28. A stud 33 is carried by the housing 31 and has rotatablymounted thereon a compound gear 34 having pinion- 35 which meshes withthe gear 29, and a large gear 36 meshing with a second pinion 37 on theend of transverse shaft 38. The shaft 38 is journaled at one end in thebracket 31 and at the other end in a bracket or housing 39 secured tothe forward face ofthe bed 10. The shaft 38 is rotated by the usualcross feedingmechanism which includes the gears 40 rotatably journaledon shafts carried by the housing 39, and the said gears terminate in aratchet wheel 41 for automatically actuating the shaft by the pick-feedmechanism or manually by a hand lever 42 for manual adjustment thereof.

In the past, substantially plane metal to metal contact was had at theways 20 and 21 between the carriage 22 and the bed 10, resulting inconsiderable friction and requiring considerable pow-- er to adjust theseveral parts. To overcome this undesirable condition there isinterposed between the ways 20 and 21 of the bed and the ways 43 and 44of the carriage 22 anti-friction rollers 45-. The structure of theanti-friction bearing on each side of the carriage 22 is identical, andit is therefore deemed sufilcient if but one of said bearings bedescribed in detail. Accordingly, the rollers 45 are providedwith anenlarged bore 46 through which a supporting pin 47 of a diameter lessthan the diameter of the bore extends. Opposite ends 48 and 49 of thepin 47 are reduced forming appropriate shoulders abutting the opposedflat faces of channel members 50 and 51. The rollers 45 are of a lengthslightly less than the distance between the reduced ends 48 and 49 ofthe pins so that the rollers are free of the channels 50 and 51 toprevent any binding thereof. As shown in Figures 2 and 4, the guidechannels 50 and 51 extend substantially throughout the length of theways ing thereon and a movable surface contacting i is with the upperpoint of the roller bearing, movement of the shiftable surface willcause the said surface-or a given point thereof to advance twice thedistance of advancement of the roller bearing-thereagainst. Therefore,as the carriage 22 is advanced the rollers 45 and guiding channels 56and 51 move therewith, and will advance'from the position shown inFigure 2 to the forward end of the guideway 20 of the bed 10, while theguideway 43 of the carriage 22 will advance beyond the end of theguideway 20 with substantially all of the roller bearings contacting theways 20 and 43 and 21 and 44.

Referring now to Figure 3, it will be noted that the carriage 22adjacent the inner edges of the guideways 43 and 44 is provided withshoulders 52 and 53 from which pins 54 and 55 respectively protrude.These pins 54 and 55 are received within the channel and engage, duringassembly, with the upper arm 56 of the channels. To exclude foreignmaterials and dirt from between the ways, the carriage 22 has secured toits outer surfaces guide plates 57 and 58 from which pins 59 and 60protrude and are likewise received in the channel for engagement withthe upper arm 56. From this it will be seen that the disassociation ofthe antifriction bearings and carriage is prevented once the saidbearings have been mounted in position.

In order to hold vibration of the carriage 22 to a minimum, the bedextension 19 intermediate the ways 20 and 21 is provided with faces 61and 62 at an angle to one another. The face 61 is disposed at an angleextending upwardly and outwardly as respects the vertical walls of saidbed extension 19, while the face 62 is substantiallyparallel therewith.The carriage 22 is provided adjacent its forward and rear walls withwebs or flanges 63 and 64 each supporting a pair of studs 65 and 66, theformer having its axis dis- .posed substantially parallel with the face61,

while the latter has its axis disposed perpendicularly or substantiallyparallel with the face 62. The studs 65 and 66 are each provided on oneend with a nut 67 and on the other end with a head 68. The stud 65 hassurrounding it and engaging the head 68 the inner race 69 of anantifriction bearing 70, with the outer race 71 thereof contacting withthe face 61 of the bed. The stud 66 on the other hand has surrounding itan eccentric sleeve 72 onwhich is mounted the inner race 73 of anantifriction bearing 74 whose outer race 75 contacts with the face 62.Each eccentric sleeve 72 has extending from it an arm 76 coupled withone another by a connecting rod 77. One of said arms 76 is secured to asleeve 78 through which the rod 77 extends. Lock nuts 79 are threadedlysecured on the end of the rod 77. A spring 80 is interposed between theadjacent faces of the sleeve 78 and lock nuts 79, whereby a yieldingpressure is maintained on the arms.

The eccentric sleeves, see Figure 4, are disposed at 180 degrees inadvance of one another so that the equalizing pressure of the spring 80in opposite directions tends to force the large portion of eacheccentric against the face 62.

In assembly the arms 76 are actuated in the direction to cause theantifriction bearing 74 to approach the face 62 thereby tending to shiftthe carriage 22 laterally of the bed extension 19. This shifting of thecarriage 22 through the engagement of the bearing 70 with the face 61acts as a cam for forcing the carriage 22 into engagement with theantifriction rollers 45 and preloading and-maintaining the said loadonthe bearings. This relative clamping or locking of the parts relative toone another reduces the vibration to a minimum and the antifrictionbearings 70 and 74 together with the rolls 45 reduce the friction to aIn assembling the parts the carriage is first assembled with all of itsparts, including the rollers 45 as supported by their channels 50 and51, being held against disassociation by the pins 53, 54, 57 and 58engaging the arms 56 of the outer channels 50 and 51. The carriage isthen positioned to have the forward antifriction bearings 70 and 74substantially midway between the length of the ways 20- and 21 where thefaces 61 and 62v are respectively cut back, as shown at 81 and 82 inFigure 4. The carriage 22 is then actuated toward the front of themachine thereby causing the said bearingsto properly engage theirrespective faces, at which time the connecting rod 77 is adjusted toproperly load the carriage on the bearings. It will be understood thatwith the carriage in position relative to the bed extension, to have theforward bearings 70 and 74 adjacent the cut back portions 81 and 82, therear bearings 70 and 74 will be outside said extension 19 to the rearbut in alignment with the bearing 'faces 61 and 62 so that the actuationof the head or carriage 22 toward the front wall causes both the forwardand rear bearings 70 and 74 to ride upon their proper bearing faces 61and 62.

What is claimed is:

1. In a machine tool organization the combiand having additionalguideways opposed to thebed guideways, anti-friction roller bearingsbe-' tween the bed and slide guideways simultaneous- 1y contacting saidways, guide bars lying along the edges of said anti-friction rollers,spacing means carried by the guide bars for definitely spacing therollers from one another, a flange extending outwardly from theguidebars, pins carried by the slide underlying the flanges to preventdisassociation of the rollers and slide, and yieldable means carried bythe slide and co-opcrating with the bed for forcing the slide intoengagement with the anti-friction rollers.

2. In a machine tool-organization the combination of a bed, a slidemounted thereon for movement relative thereto, co-operating guidewayscarried by the bed and slide, and means for eliminating side playbetween the bed and slide and for holding the guideways to one anotherincluding 'a pair of surfaces disposed at an angle to one another formedon the bed beneath the slide, a pair of anti-friction bearings carriedbysaid'surfaces tends to force the slide onto the bed.

3. In a machine tool organization the combination of a bed, a slide onthe bed for movement relative thereto, anti-friction rollers between theslide and bed, cage means for spacingthe rollers relative to oneanother, means carried by the cage and slideco-operating with oneanother to prevent inadvertent disassociation of the bearing rollers andslide, additional means carriedby the slide and 'bed tending to forcethe slide into engagement with the anti-friction rollers and comprisinga pair of angularly disposed surfaces formed on the bed, anti-frictionbearings carried .by the slide for engagement with said surfaces,

- between a slide and its support the combination witha bed and asuperimposed slidetherefor, of

a guiding surface disposed normal to the line of movement of theslide, asecond surface opposed 'to the first surface in an angularly relatedrelation, an anti-friction bearing carried by the slide for engagementwith the normal face, a second anti-friction bearing carried by theslidefor engagement with the angular face, means for mounting one ofsaid bearings eccentrically to its-face whereby-shifting movement of thebearing eccentrically causes a lateral shiftingofthe slide and bearingabout its eccentric mounting.

5-. In-a machine tool organization the combination of a bed, a pair ofplane horizontally disposed guide ways thereon, a slide associated withsaid bed and having formed thereon a pair of plane horizontally disposedguide. 'ways in opposition to the guide ways of the bed, a second pairof guide ways formed on the bed intermediate the first pair of saidways, said second pair of guide. ways being angularly related. to onean-' other and to the first pair of guide ways, and antifriction meanscarried by the slide and co-operating. with the second pair of guideways for ac curately positioning the slide and its guide ways relativeto the bed and its first-named guide ways.

6. In a machine tool organization the combination of a bed, a pair ofplane horizontally disposed guide ways thereon, a slide associated withsaid bed and having'formed thereon a pair of plane-horizontally disposedguide ways in opposition to the guide ways of the bed, a second pair ofguide ways formed on the bed intermediate the first pair of said ways,said second pair, of guide ways being angularly related to one anotherand to the first pair or guide ways, anti-friction means carried bytheslide andco-operating with the second pair of guide ways foraccurately positioning the slide and its'guide ways relative to the bedand its first-named guide ways, and antifriction bearings disposedbetween the plane horizontally disposed guide ways of the bed and slide.

'7. In a machine tool organization the combination of a bed, a pair ofspaced guide ways having a plane supportingsurface extending in asubstantially horizontal plane,.a slide associated with said bed andhaving formed thereon a pair of spaced guide portions substantiallyco-extensive with the guide ways of the bed, a plurality of.anti-friction rollers between the bed and slide guide ways'forsupporting the said slide during its movement, a second pair of spacedguide ways formed onthebed and disposed between the said first pair ofguide ways, said second pair of guide ways being angularly disposed toone another and tothe opposed ways of the bed and slide, and

means carried by the slide co-operating with the second pair of guideways for controlling the lateral position of the slide with respect tothe bed and for holding the slide on the supporting anti frictionbearings.

*8. In a machine tool organization the combination of a bed, a pairofspaced guide ways having a plane supporting surface extending in asubstantially horizontal plane, a slide associated with said bedandhaving formed thereon a pair of spaced guide portions substantiallyco-extensive with the guide ways of the bed, a plurality ofanti-friction rollers between the bed and slide guide ways forsupporting the said slide during its movement, a second pair of spacedguide ways formed'on the bed and disposed between the said first pair ofguide ways, said second pair of guide ways being angularly disposed toone another and to the opposed 'ways of the bed and slide, means carriedby the slide cooperating with the second pair of guide ways forcontrolling the lateral position of'the slide with respect to'the bedand for holding the slide on the supporting anti friction bearings, andmeans associated with the supporting bearing rollers for properlypositioning same with respect to the opposed guide ways of the bed andslide. I 9. In a machine tool organization the combination of a bed, apair of spaced guide ways having a plane supporting surface extending ina substantially horizontal plane, a slide associated with said bed andhaving formed thereon a pair of spaced guide portions substantiallyco-extensive with the guide waysof the bed, a plurality of anti-frictionrollers between'the bed and slide guide ways for supporting the saidslide during its movement, a second pair of spaced guide ways formed onthe bed and disposed between the said first pair of guide ways, saidsecond pair of guide ways being angularly disposed to one another and tothe opposed ways of the bed and slide; means carried by'the slidecooperating with the second 1 pair of guide ways for controlling thelateral position of the slide with respect to the bed and for holdingthe slide on the supporting anti-friction bearings, comprising afollower for each of said second pair of guide ways, and yielding meansfor maintaining contact between the followers and their guide ways.

10. In a machine tool organization the combination of a. bed, a pair ofspaced guide ways having a plane supporting surface extending in asubstantially horizontal plane, a slide associated with said bed andhaving formed thereon a pair of spaced guide portions substantiallyco-extensive with the guide ways of the bed, a plurality ofanti-friction rollers between the bed and slide guide ways forsupporting the said slide during its movement, a second pair of-spacedguide ways formed on the bed and disposed between the said first pair ofguide ways, said second pair of'guide ways being angularly disposed toone another 15 relative movement of the slide and bed, and cooperatingmeans associated with the bearing roller spacing means and slideto,prevent inadvertent disassociation of the roller bearings and slide.

SOL EINSTEIN. FREDERICK S. HAAS.

